Range of newly added tags

[Affenklaus]

One of the new patches added several new undefined country tags but I can't find how much of them were added althought I know it was written somewhere on the forums.

I thought it was UA0 to UZ9 but while the UA_ tags work, the UU_ tags don't.
So what's the "highest" tag that was added? UA0 to U__?

 

[Affenklaus]

I did some testing now: The upper limit of the new tags seems to be UF9.
I thought it was supposed to be higher but I can't find the thread with the patchnotes for the patch that added the new tags so I might be wrong.